Dear all,
I would design a cable system, which has several hanged masses between 2 columns. i just made a simplier case with 3 wires and a truss between them subjected to tension.
I don`t understand the warning that I got. I tried to solve the instability with releases (fix the Rz, because Uz has to be free), but it didn`t work. Also the matrix warning, because I thought it appears because of the buckling of the column, but when I made a solid 400mm diameter column, it still appears.
The main goal is to define the prestressing of the cables and I will have this kind of system with 7 cables, therefore I planned to use relative elongation and iterate until I find the right position of the pre-defined nodes, where the point loads has to be.
Please comment my model, I would really appreciate, especially because my first experiences with this forum was great, but so far I didn`t get any other help.
Thanks in advance!
Solved! Go to Solution.
Solved by vanvan11. Go to Solution.
now when i calc no warnings
is that ok? is warnings was problem
only thing i make to your model was to separate the upper cable in to 2 pcs couse point 2 which was instable to have conetions whit the upper cable
so i think that was the problem
tell me if my solution is ok for you
see my model
sry for my bad engl
Dear Ivan,
Yes, your solution was right for this model, thank you! However this model was a simplier one, the real structure is like a wire chain with some bars to keep the distance between them.
I attached this model, because still there are the same error messages. I dont know why, because now every cable or wires are seperated respect to the nodes.
Dear Rafa.Gaweda,
Thanks for the suggestion, I guess I have to "play" with this elongations to be good for all of the cables to reach more or less zero deflections for the specific nodes.
However, I have now another important issue, because I can not make a proper material definition for these cables. Picture attached.
I would set a smaller Young modulus for the cable due to I would take into consideration that it is more flexible at the installation, also it is a high tension cable, with a larger self-weight which I can not set! Why? (It is Robot 2014 version.)
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